The butterfly society maintains a database of all types of butterflies within the United States. One database table will store the butterfly species name and classification, with each species uniquely identified by a registration number. A second table will contain butterfly characteristics, uniquely identified by a characteristic number, and will be linked to the species table by the registration number. The primary key of the species table is:
A. species
B. registration number
C. classification
D. characteristic number
Answer: B. registration number
Business
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